Brother International BES-1240BC Instruction Manual - English - Page 266

Chapter 12 Trouble Shooting Symptom Measures Cooling fan motor stops. Exhaust fan motor stops. When all three fans in the control box stop • Refer to the block diagram showing the cable connections and check to see if connection from connector P5 of the power PCB in the control box to connector P1 of the power supply PCB in the power supply base, and connection from connector P4 of the power supply PCB in the power supply base to the 18v terminal of the power transformer are proper. • Check fuse F3 on the power supply PCB in the power supply base. If it is blown, replace it with a new one. If it becomes blown again, the 24v system circuit is faulty. Only cooling fan motor stops. • Check to see if the cooling fans on the left of the main PCB and inward of the power supply PCB are rotating. If either of them is at standstill, check to see if connection from the cooling fan which is at standstill to P20 or P25 of the power supply PCB in the control box is proper. If they are connected properly, replace the cooling fan which is at standstill. • Both cooling fans are rotating. Check to see if connection from connector P16 of the main PCB to connector P10 of the power supply PCB in the control box is proper. Replace the main PCB with a new one. • Check to see if the cooling fan on the right side of the main PCB is rotating. If it is at standstill, check to see if connection from the cooling fan to P12 of the main PCB is proper. If they are connected properly, replace the faulty cooling fan. • The cooling fan is rotating. Replace the main PCB with a new one. Power voltage upper or lower limit error occurs. • Is the voltage set on the machine controller? If not, set it according to the power supply voltage of the area where the machine is used. • Is the tap voltage of the power transformer (terminal connection of mark tube T) adjusted to the power voltage of the area where the machine is used? If not, switch the tap connection. • Check the input voltage values in the power/voltage check test mode. Measure the power supply voltage with the tester and compare them. If the voltage value is significantly out of the normal range (±5v or more), calibrate it with the voltage calibration in the PC test mode. • When you cannot enter the test mode because this error frequently occurs, set the voltage to a relatively high value with the machine controller if it is E-D2 and to a relatively low value if it is E-D3 to avoid errors. Check and calibrate the voltage in the test mode. • Check to see if connection from connector P16 of the main PCB to connector P10 of the power supply PCB in the control box is proper. • Is the power supply abnormally low because a machine with a large capacity (compressor and the like) is used? Change the power to the other system. Use a stabilizer. • Replace the power PCB with a new one. Replace the main PCB with a new one. 264 BES-940BC • BES-1240BC